We had one last winter, a young guy who had been through several times not only take off down the track, but jump both wheels to the right off the inside guide rail and drove virtually all the way down the tunnel, sideswiped a rinse arch breaking a nozzle, jump back on the conveyor just before running over the tire shine and continue out the exit.
He came back and told me the conveyor did and was I going to fix the scratch now on his vehicle. We went in the office and reveiwed the video. Upon viewing it I told him that it was his fault and that if he pursued the claim that I would be sending a copy of this to his insurance company along with a bill for the damage he caused to my equipment. He left and brought his mother back. She reviewed the video, looked at him and called him a 'dumbass' right in my office!
If you run a car wash today without many video cameras you can never know what is going on when you are not there nor avoid the headaches of customers doing 'stupid customer tricks' and then outright lying about what happened. It is worth its weight in gold.